Stop-motion mechanism with tripper device



Dec. 2, 1924. v 1,517,390

W. T. BARRATT STOP MOTION MECHANISM WITH TRIPPER DEVICE Filed July"1O 1925 Patented 2, i924.

WILLIAM BARR-ATT, 6F BENNING'TON, VERMONT.

Application filed July 10, 1923.

To r47Z LC/20772 it may concern Be it known that I. l Vnmnur T. BARRA'LT. a citizen of the United States, residing at Bennington. in the county of Bennington and State of Vermont have invented new and useful Improvements in Stop-Motion .hiiechanism with Tripper Devices. of which the following is a specification.

T his invention relates to improvements in stop motion mechanisms for machines in which a strand or strands of yarn are employed in the manufacture of fabrics.

The particular embodiment of my invention hereinafter set forth in the specification and embodied in the claims is especially adapted for use in connection with knitting machines.

The object of the invention is to provide a stop mechanism which will stop: the machinev when the yarn which is fed into the machine has a bunch or enlargement thereon and is subjected to excess tension or undue strain, for example, when the strand of yarn becomes knotted or has kinks or enlargements therein.

The object of the invention is further to provide a stop mechanism which will collect upon a tripper device loose lint or Waste from the yarn and after a certain an'iount of said lint or waste collects upon the tripper device the same will be actuated by the yarn to stop the machine.

Another object of the invention is to provide a tripper device which will act with very little friction on the yarn to operate a stop mechanism.

The object of the invention is provide a series of tripper devices each of which constitutes a guide for a strand of yarn and each of which will act to stop the machine independently of the other tripper devices.

It will be understood, therefore, that the main object of the invention is to provide a very sensitive tripper device to actuate the stop motion. whereby a machine employing the lightest and frailest kinds of yarn may bestopped when the yarn has kinks, bunches or enlargements therein, said tripper device acting to remove loose lint or waste from the yarn while it is feeding to the machine and which is capable of operating to actuate thestop mechanism to stop the machine'whena. certain amount of but or Waste has gathered thereon.

Qther objects and desirable results to he further to STOIP-MOTION MECHANISM NIT-H TRIPPEB DEVICE.

Serial No. 650,568.

attained will be more fully hereinafter set forth in the specification.

The invention consists particularly in a tripper device and the manner in which it operates to cause a stop mechanism to be actuated to stop the machine.

This invention. in so far as the principal part of the stop mechanism is concerned. is substantially the same as the mechanism disclosed in my United States Letters Patent No. 1,461,172, patented July 10. 1923 and in many respects the stop mechanism issimilar to the stop mechanism patented by me No. 1.173.244. patented February 29. 1916 and No. 1,186,645, patented June .13. 1916. to which Letters Patent reference may be had with relation to the details of the stop mechanism.

To these ends and others hereinafter appearing in the specification the invention consists in the combination and arrangement of parts set forth in the following specification and particularly pointed out in the claims thereof. 1

Referrin to the drawings Figure 1 is a plan of a portion of the stop mechanism of my invention. illustrating the tripper device and the portion of the stop mechanism immediately connected therewith, the same being broken away to save space in the drawings.

Fig. 2 is a sectional elevation taken on line 22, Figure 1. the same being broken away to more clearly illustrate the invention.

Fig. 3 is an enlarged side elevation partly in section and broken. of one of the trippcr arms shown in connection with a rock shaft upon which it is pivotally mounted.

4 is a perspective view of one of the tripper, arms in reversed position.

Like numerals refer to like parts in the several views of the drawings.

In the drawings. 10 is the frame of the machine. 11 is. a rotary shaft to which are fastened toothed discs 12 and 13 which constitute rotary stop members. 14 and 15 are oppositely disposed brackets; The bracket 14 has a rock shaft 16 pivotal-1y mounted thereon and at one end of said shaft an arm 17 is fast thereto and projects upwardly, terminating in a yarn guide 18. This arm is provided with a slidably adjustable weight 19 whichis held in adjusted position by a spring 20, Fig. 2. I

A stationary yarn guide Qfi is' positioned above the yarn guide 18 and is fastened to the bracket Another yarn guide 2:: is positioned beionthe yarn guide 18 and is mounted on a bracket which is adjnstabl i fa nei to the bracket Lt. that the yarn yarn 2%. which yarn extends from a bobbin, not shown in the drawings, and passes through a stationary yarn guide fast to the frame oi? the machine. through the yarn guides 22 18 and 2t and thence passes to the machine where it is guided to the needles in the usual manner.

The arm 17 is normally, that is, when the yarn is passing through the yarn guide 18 under tension during the operation of the machine, )OSltlODGtl at a slight angle to a vertical plane containing the axis of the rock shaft 16. it is prevented from assun'iing at any time a ertical position by abutting against the bracket 23, so that when the yarn 2% breaks, the arm 17 and yarn guide 18 will tip downwardly and bring a locking arm which is fast to or forms a part of the rock shaitt 16, into the path of the rotary stop member 13 and the arm 26 will abut against a normally stationary stop 27. The arm 26 will thus act as a. locking means, which stops the rotation or the rotary stops l2 and 13 and the shaft -ll to which they are tastened. noisy this occurs, the stop mechanism of the machine will be operated to throw out the clutch and stop the niai hine, as set forth in said Letters Patents No. 13161;? 2 and No. 1,1732%.

The yarn 2st, Fig. 2. is'ledirom abobbin, not shown in the drawings, through yarn guides 25, 22, 18 and 213Fig; 2, to" the needles of the machine, the yarn guide 18 being supported upon an arm 17 which extends upwardly from a rock shaft '16" pi\'ot ally mounted on the bracket 15 and pro ridcth at the opposite end thereof from that to which the arm 17 is attached with a laterally extending arm 26 which is adapted to be engaged by the rotary stop member whenthe yarn 2% brealis and to alaitv against the normally statioin 23", thus stopping the machine, as before described.

The operation of the yarn guide l8 and its associated parts is the same as that of the yarn guide 18 hereinbet'ore described. the only difference being that the arm 26' projects in the opposite direction from that of the arm 26.

The number of bobbins and the number of yarn guides and rotary stops maybe increased as desired and all operate as hereinbefore described.

The mechanism hcreinbefore described is substantially the same as that set forth in igiqd United StatesLetters Patent No. 1.461,-

The novel tripper device and its connections with the stop mechanism will now be described. A. rock shaft 28 is pivot-ally mounted on brackets 29 and 29 fast to a bar 30, which in turn is fastened to the frame 10. Said rock shaft has a rocker arm 31 fast to one end thereof and having a pin projecting laterally therefrom and forming in eiiect a part thereof. lVhen in its normal position the pin 32 is out of contact with the rotary stop member 12but can be thrown into engagement therewith by the rock shaft 28 when the same is roched by any one of a series oi tripper arms 33. All or these tripper arms are alike out only one shown in the drawings, the same consisting of a piece of flat thin metal which isprovidedrwith a hole 3s; connected by a slot 35 to one end of said tripper arm. The other end of said tripper arm is bent to form an eye 36 in which is provided a slot l he ej/c portion 300i the tripper arm is loosely mounted upon the rock shaft 28 and a pin 38 fast to said rock shaft projects through the slot 37, as shown in Figures 2 and The tripper arm 33 normally rests upon a stop rod 39 fastened at its opposite ends to the brackets 29 and 29 and when so resting the pin 38 will be located iii said slot adjacent the mixer end thereof, as illustrated in Fig. 3. I i

It will be understood that there are pivot ally mounted upon the rock shaft 28 a plurality ot these tripper arms 33 and each one operative independent or the others, that is. it the 'trippe'r arm as shown in Figs. and 3. is in its normal position and resting against the stop rod .39 and a kink or enlargement in the yarn,-0r an accumulation'ot lint on the yarn, causes the yarn to lift the tripper arm 33, which it will do as soon as the tree passage of the yarn tlniough the hole is restricted. then the tripper arm 33 will be lifted from the position shown in full lines Fig. 2 to the position shown in dotted lines therein and the inner end of the slot 37 will abut againstthe pin 38 and rock the rockshatt 28. it the same time the pins 38 for the other tripper a" is will. move in their respective slots 3"? ant their respective tripper arms 33 will ren-iain stationary. The object at this'construction is to render the device as sensitive as possible and to give the yarn as little work as possible when it rocks the rock shaft 28.

When the rock shaft 28 is rocked, ash'ere inb'efore described. the rocker arm l will rock with it from the position shown in full lines 2, to the position shown in dotted lines therein and the pin 32 on said rocker arm and which forms ineil'ect part thereof is then brought into the path of the teeth 12 ot'the rotary stop member 12. One of said teeth will then engage the pin 32 and the rotation of the toothed disc orrotary ill) stop member 12 will be stopped, together with the rotation of the shaft 11, and the stop motion will then operate as descril'ied in said Letters Patent No. 1,451,172, to stop the driving shaft of the knitting machine and thus the parts driven by said driving shaft will come to a stop.

Another series of tripper arms in connec tion with the yarn 24 are employed to actuate the stop mechanism. One of these tripper arms 33 is illustrated in Figures 1 and 2, and the operation thereof is the same as hereinbefore described in relation to the tripper arms 33, except that they are loosely mounted in a like manner upon a rock shaft 28' and rest when intheir normal position upon a stop rod 39. The rock shaft 28 has an arm a'-() fast thereto which is connected by a link 41 to another rocker arm 42 which .is pivoted to rock on a pin 43 fast to the bracket 29; This rocker arm has a pin 44- fast thereto which is brought into alignment with the teeth 12 of the rotary stop member 12 when the arm 42 is rocked by the arm 40 and one of the tripper arms 33'.

It will therefore be seen that when any one of the tripper arms 33 is rocked by an enlargement or kink or by accumulated lint on its respective yarn 24:, said tripper arms will rock the rock shaft 28 and will move the rocker arm 40 from the position shown in full lines to the position shown in dotted lines, Fig. 2, whereupon the rocker arm 42 will he rocked on its pivot 43 to bring the projection ea thereon into the path of the teeth 12' of the rotary stop member 12. Vi hen this occurs the rotary stop member will be stopped, together with the shaft 11 and the stop motion mechanism will be operated to stop the knitting machine as described in said United States Letters Patent 1,461,172. The stop motion mechanism will also be actuated to stop the machine when the yarn runs out, or when it breaks, by the arm 17, rock shaft 16 and arm 26, or by the arm 17', rock shaft 16' and arm 26, all in the manner setforth in said United States Letters Patent 1,461,172.

It will therefore be seen that the stop motion mechanism will be operated to stop the knitting machine, either when the yarn breaks or when it runs out, or when there is an enlargement or kink therein, or when lint accumulates on the tripper arms the stop motion will be actuated to stop the machine by one of the tripper arms of the mechanism hereinbefore described, whereby said stop mechanism is thrown into operation.

it is desirable that the tripper arms should be capable of a slight angular movement before they operate to rock their respective rock shafts and to attain this end the inner end of the slot 37 does not engage the pin 38 when the tripper arm is in the position illustrated in Fig. 3, or in its normal posi v tion, but will engage said pin when the tripper arm has been moved by the yarn through a predetermined angle. By this construction a slight angular movement of the tripper arms is possible withoutthe machine being stopped by such movement.

I claim 1. A stop motion mechanism for a knitting machine having, in combination, arotary stop member, a rock shaft, a rocker arm fast thereto, a tripper arm loosely mounted to swing on said rock shaft, a projection on said rock shaft adapted to be engaged by said tripper arm, wh reby said rocker arm may be moved into interlocking engagement with said rotary stop member and the rotation-of said rotary stop member stopped and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of the driving shaft of said knitting machine.

2. A stop motion mechanism for a knitting machine having, in combination, a rotary stop member, a rock shaft, a rocker arm fast thereto, a tripper arm loosely mounted to swing on said rock shaft, a projection on said rock shaft adapted to be engaged by said tripper arm after it has been rocked by the yarn through a predetermined angle, whereby said rocker arm may be moved into interlocking engagement with said rotary stop member and the rotation of said rotary stop member stopped and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotationof the driving shaft of said knitting machine.

3. A stop motion mechanism for a knitting machine having, in combination, a rotary stop member, a rock shaft, a rocker arm fast thereto, a plurality of tripper arms mounted on said rock shaft each constituting a yarn guide, a series of projections on said rock shaft, each of said projections projecting into a slot provided in each of said tripper arms respectively, whereby each of said tripper arms may be rocked by its respective yarn to rock said rocker arm into interlocking engagement with said rotary member independently of the other tripper arms and whereby the rotation of said rotary stop member may be stopped, and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of the driving shaft of said knitting machine.

4-,. A stop motion. mechanism for a knitting machine embodying a rock shaft, a plurality of tripper arms looselycmounted to swing on said rock shaft, and a series of projections on said rock shaft projecting into slots in said tripper arms, whereby each of said tripper arms may be actuated by its respective yarn to rock said rock shaft 1ndcpend'ent of the other tripper arms of said series.

A stop motion mechanism having, in combination, a rotary stop member, a rock shaft, a rocker arm :0 fast thereto, another rocker arm pivotally mounted adjacent to said rotary stop member, a link connecting said rocker arms 40 and to each other a tripper arm mounted on said rock shaft and constituting a yarn guide, whereby said rocker arm may be rocked into int r locking engagement with said rotary stop member and the rotation of said rotary stop member may be stopped and mechanism actuated by the stopping of said rotary stop member constructed and arranged to stop the rotation of the driving shaft.

6. A stop motion mechanism having, in combination, a rock shaft, a piurality of tripper arms constituting yarn guides, loosely mounted to swing on said rock shaft, projections on said rock shaft each adapted to be engaged by its respective tripper arm when said tripper arm is rocked by its respective yarn on said rock shaft and mechanism adapted to be set in operation by said rock shatt constructed and arranged to stop the rotation of the driving shaft of said knitting machine.

In testimony whereof I have hereunto set my hand in presence of two subscril'iing witnes'ses.

\VILLIAM '1. BARRXYI.

Vitnesses HARRY S. Mosns, FRANK HURLEY. 

